Boring tool



1 May 15, 1928.

C. H. SCHMIDGALL BORING TOOL Filed Ami; 15; 1927 Patented May 15, 1928.

UNITED STATES N FFI E- CARL H. S'CHMIDGALL, or s art; ILLINoIsL Bonnie TOOL. v T

Application filed April 15, 1927. Serial No. 184,029.

This invention relates to boring tools particularly of that type for boring holes of irregular form. a. 1 T y a T An object of the invention is to provide a tool of a particularly rugged structurecapable of performing heavy continuous work in practically all forms of material including metal. T Another ob'ect is to provide a boring tool W wherein all strains are relieved from the gear members employed for, driving the cutters with which the tool is provided to, the

end that said tool will have long life and continue tobore accurately.

milling cutters as part of the boring elements of a form adapted to operate inconjunction, certain of them intermeshing with T and timed with the maincutters for remov- 2c ing any slight material left by said main cutters. a d a y T Other objects and advantages will "be made known herein'aided by the" appended drawing wherein v n V Figure 1, is an elevation of the boring tool as seen in one of itspositions.

Figure 2 in an elevationof portion of the same rotated one quarter turn from the position shown in Figure 1. 3L2

boring end. T a

Figure 4 is a transverse section of the tool on line H. Figure 1, and

Figure .5 illustrates apart of the'tool as seen in Figure 2, but greatly enlarged, be-

ing in part section to show interior cone struction, and with the cutter seen Figure 2 removed. r

I am familial-with the art pertainingto 4n boring tools ofthe type mentionedand shall point out wherein the tool under consideration differs in structure and advantages.

The handle of the tool is denoted by the character 1, which is of generous proper-a tions but reduced at one end nto a spread flattened bodyQ. Substantially central of the body and extending from each ofitsopposite flat faces is a raised integral flange 3.

Inward from" the flanges, which coincidein position on the body, arefour holes 4 cutting entirely through the body 2, These holes are spaced equal distances apart and are all spaced equally from a central point within the confines of the said flanges 3.

Still another objectis that of employing Figure 3 shows the toolas seen from its Havingposition within each hole is abevel pinion. {5 two of which lie opposite 0116311 other with their axes in line with theylon- 'gitudinal line of the tool while the. other two, likewise opposite each other, lie with their axes at rightanglesto the first two described. One of the pinionsis mounted on a driveshaft 6 extending through the handle 1, saidshaft being reduced in diameter inward from the pinion and has a bearing in a socket 7 ofthe body. The pinion lying opposite that carried .by said shaft 6 stance, rest in sockets 14 andit is now seen;

that each of the shaftsconsidered herein are carried is mounted on a shaftS which has a bearing in the outer end of the body Qand likewise has abearing in the body 2 at opposite sides of the pinion carried by it. p

The pinions all have the same number of teeth and these project from the holes 45 in y whichthey are positioned, all being adapted to mesh with two gears 15, one at each side of thelbody, said gears being partjof or aflixed to cutters 16 Figure i.

Y Ahub or boss 17 extends from each side of thebody centrally of the flange 3 and each receives one of the cutters 16. a ;A a

threaded hole 18 extends through both bosses and a screw 19, but one of which is shownQFigure ,4, serves to maintain the gears 1'5 and pinions in. operative engagenient. cutter 16 has an annular groove 20 111,1t-S 1I1I181' face adaptedto receive into it the adjacent flange-3'when the gears are brought into mesh with the pinions, said cutter thus constituting me ns for excludingdust and cuttings from the working parts within; The cutters 16 are patterned aftera well "known type of n'iillingcutter, being relieved at each side, J as shown, leaving the teeth thereof projecting to vprovide fora clearance way for said cutter, or rather its body, The'type of tooth isclearly; indi; cated in Figures 1.2 and 3.

Thecutters 13am of'the star typeand are greater in diameter than the distance between the teeth of the cutters a 16 and lie in such a position as to workthrough the teeth of the latter. That is to say, the pinions 5 have ten teeth, the gears l5 have twenty, there being therefore a two to one ratio. The cutters have tive teeth andthe teeth of the cutters 16 are twenty in number. It will be understood, therefore, that although the diameter of the cutters is greatcr than the distance between the teeth of cutters 16 as stated, the teeth of the two sets of cutters by their proper timing will intermesh after the fashion of meshing gear teeth except that there need be no contact thereof. The purpose of this action is that material that is not removed by the cutters 16 where it lies between themwill be entirely removed by the intermeshing of both sets of teeth leaving a clean smooth hole. A study of Figure 3 will show that a clean square hole would'be bored.

Power applied to the shaft 6, through the pinion thereon, will drive the other three pinions in the same direction since all of themare engaged by both gears 15. The two cutters 16 will therefore rotate in opposite directions, their teeth being opposite ly directed for that reason. In boring wood, the cutter 11 may be used but for metal work the tool is used without this member, the body 2 being entered. into a previously prepared hole, milling themetal away to create a square aperture or apertures of other shapes depending upon the forms of cutters employe Holes of larger diameter than can. be bored with the sizeof tool illustrated herein may be created by substituting cutters corresponding to 16 but of greater diameter and thickness, the cutters 13 being replaced by those of greater thickness to the end that the teeth of both sets of cutters will still provide clean walls in the bore. Also. cutters of different forms may be substituted for all. those shown so that various holes of various shapes may be bored.

it is to be noted that there are no strains on any of the pinions other than the driving strains in that. first, the shaft 8 carrying the cutter 11 bears against the. body 2 by its shoulder 10 and. the pinion of that shaft, therefore, will not be crowded into the gears 15. socketed at 7 so that pressure necessary for boring is placed against the body 2. Again, since each of the shafts is journaled at both sides or the pinion it carries, there can. be no lateral strains on them which would be particularly trueof the shafts 12 carrying.

the cutters 13 whereconsiderable lateral strain would be imposed by the latter. Further, the cutters 16, with their gears 15, it will be observed, are journaled on the studs or bosses 17 and the latter since integral with the body 2 and of generous diameter and proportion constitute very rigid sup, port for said cutters, the bearing thereon Second, the drive shaft 6 is being wide so that these members cannot rock and cramp their gears upon the pinions. The tool is thus very sturdy throughout, it can gii-e no trouble, and is excellently fitted for longuse under heavy duty. Also, in addition to the facts pointed out the body 2 is a one-piece structure so that there can be no racking or weaving as would be possible when using a body of connected parts.

Referring again to the boring of metal where a round hole has already been bored, a plug, not shown, that just "fitssaid hole takes the place of the cutter 11 and guides the milling cutters to the Work.

I claim:

1. A boring tool including a substantially flat body having a series of openings extending through it from side to side, said openings being disposed in even spaced relation, a pinion in each opening, a separate shaft for each pinion; two of .them being in line with the longitudinal axis of the body, and one of them extending out through said bot y. at its narrow side acting as a drive shaft, two of the other shafts lying at right angles to the axis of the drive shaft extending from the edges of the body, a cutteron the outer end of each, and a gear at each flat side of the body in mesh with the several pinions, each including a cutter.

2. A boring tool including a substantially flat bodyhaving a series of openings extending through 1t from sldeto side, said openings being disposed'in even spaced relation, a pinion in each opening, a separate shaft for each pinion. two of them being in line with the longitudinal axis of the body, and one of them extending out through said body at its narrow side a'cting as a drive shaft, the other also extending out through said body at its opposite narrow side, a boring tool carried by the last named shaft, a shaft lying at right angles to the drive shaft in each side ofthe body and each extending out through the narrovfl ide of the same, a cutter on the outer and of each, and a. gear at each flat side of the body in mesh with the several pinions, each including a cutter.

A boring tool including a' one-piece body having a series of four openings extei'iding entirely through itopcning upon opposite sides of said body, the same being evenly spaced from one another around a common point andcqui-distant from that agear at each of two sides of the body meshing with all of the pinions, and a cutter lined with respect to each gear, each combined gear and cutter being rotatable upon one of said studs or bosses.

4;; A boring tool including a body of a single part having a series of four openings extending through it from one side to the other and being equi-distant from one an other around ltCOll'lll'lOll point. apiiiion 111 each opening, a separate shaft for each pin-i 1011, each shaft having a bearing at each Skill of the pinion carried by it, one of the shafts acting as a drive shaft, a cutter on eachof two of the shafts that lie at right angles to saiddrive shaft, a fixed stud or .boss extending from opposite sides of the body at right angles to theplane in which the shafts lie, and a gear including a cutter mounted to rotate on each stud or boss, each said gear meshing with all of the pinions.

5. A boring tool including a body having an annular flange extending from each of two opposite sides thereof, driving pinions withinsaid body within the confines of the flanges, a gear journaled at each of two opposite sidesof thebody meshing with said pinions, and a cutter fixed with respect to each gear, each said cutter having an an nular groove in its faceto receive into it a flange of said body.

6. A boring tool including a body having an annular flange extending from each of two opposite sides ofthe saine, gearing'in said body, a cutter mounted to rotate at each of two opposite sides of the body driven by said gearing, each cutter having an an nular groove in one of its faces coinciding g in position with the flanges and adapted to receive one of the SRIIIGlIitO it;

7. A boring tool including a body, driving gearing therein, a toothedcutter at each of two opposite sides'of the body rotatable through the saine'and having a driving pin ion thereon, a gear at each of two opposite sidesof the body ineshingwith said pinion,

each including a toothed cutter, a toothed cutter at each of two other sides of the body whose teeth areadapted to interinesh with those ofthe first nanied cutters, and a pinion operatively connected with each of the second'na ned cutters for driving the same 1 and each meshing with the gears of said first named cutters. I

9. A boring tool including an elongated through the same and having a driving pinion thereon, a gear at each of two opposite sides of the body meshing with said pinion, each including a toothed cutter, a toothed cutter at each of two other sides of the body body, a drive shaft extending longitudinally whose teeth are adapted to inte rinesh witli those of the first named cutters, a pinion operatively connected with eachof the second nained cutters for driving the same and each 'nieshing with the gears of said first named cutters, a shaft axially in line with the drive shaft includinga pinion in inesh with the said gears, and a cutter mounted on said shaft. I

10. A boring tool including a body providedwith a recess in its side and having a circularfiange projecting from the surface of said side encircling the recess, a cutter having inone side a circular groove adapted to receive the flange into it, and also having gear teeth on said side extending into the recess, a driving pinion in said body,

extending into the recessengaging the teeth of said cutter," and a bearing for said cutter. I 11. A boring tool including a- 'bodyypro vided with a recess in each of two opposite sides and having a circular flange extending froin'eacli side surrounding the recess there- 111,'L hub extending from thebottoni of each recesscentrally with respect to the flange, a q

cutterbored to receive the hub andhaving a circular groovein oiieiside to engageover the flange and also having teeth on that side to lie in the recess, and a ClliVlfl g plIilOll cutters. a a i i 12. A boring tool including anelongated within the body engaging the teeth of both body, a driving shaft extending longitudinally throughthe same, a pinion thereon within thebody, a cutter mounted at each of two opposite "sides of the body including gear teeth to engage the pinion, a cutter mounted at each of two other sides of the body, and a pinion for driving eachof the last named cutters,the saine meshing with the gear teeth of the first named cutters,

the teeth of one pair ofthe cutters arranged to interinesh with those of the other pair.

In testimony whereof I affix my signature.

CARL SCHMIDGALL. 

